/Engine/Source/Runtime/SlateCore/Public/Layout/PaintGeometry.h
Special case method to append a layout transform to a paint geometry. This is used in cases where theFGeometrywas arranged in desktop space and we need to undo the root desktop translation to get into window space. If you find yourself wanting to use this function, ask someone if there's a better way.
void AppendTransform ( const [FSlateLayoutTransform](API\Runtime\SlateCore\Rendering\FSlateLayoutTransform) & LayoutTransform )